Electronics Mod

How can i find what parts fit in a "Bane" hilt by Saber Forge?

Link: https://saberforge.com/products/bane...nt=27915990791

I found this tutorial, but it uses a hilt from here, so I'm not sure where to go to find out what parts i need that would fit if i just bought the stunt version and did it myself.

Link: https://www.youtube.com/watch?v=pOpU...J4cbYzS-6QQ_Uq

I'd like sound, LED, and if it's possible, RGB LED.
Any help would be appreciated, I'm just now researching this stuff so it's all new to me.